The extra goroutines were distracting while debugging something else,
especially as I wasn't using that feature. This also saves a bit of
memory.
Change-Id: Ia6489e64bbd3d5a6ff699a25018676d8ff8bd2e4
Reviewed-on: https://go-review.googlesource.com/112635
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Han-Wen Nienhuys <hanwen@google.com>